Here we present ZL-1211, a novel CLDN18.2-targeting monoclonal antibody that was engineered to promote enhanced ADCC and to drive efficacy in tumors that exhibit a broad range of CLDN18.2 expression levels....Consistent with our in vitro findings, ZL-1211 also exhibited greater anti-tumor efficacy than the leading clinical benchmark in CLDN18.2-positive patient-derived xenograft and syngeneic models in vivo.